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Bard part 800-0150 is an OEM expansion valve assembly used in Bard wall mounted air conditioners and heat pump units to meter refrigerant into the evaporator and maintain stable superheat across changing loads. If your unit is icing, hunting, running low capacity, or showing erratic suction pressures, a correct Bard valve assembly is often required to restore proper refrigerant control and protect the compressor. Because expansion devices are application specific by refrigerant, tonnage, and coil circuiting, confirm the exact Bard model and serial number and match this part number before ordering for a proper fit and dependable operation.